Battery pack and electric device

Abstract

The application discloses a battery pack and an electric device, and belongs to the technical field of batteries. The battery pack comprises a fixing member, the fixing member is provided with an exhaust cavity; a plurality of liquid cooling plates are arranged around the fixing member and are connected to the fixing member; and a plurality of single batteries are arranged around the fixing member, each single battery is arranged between two adjacent liquid cooling plates, and the single battery comprises a first wall, a second wall and a third wall which are connected, and the first wall is in close contact with one of the two adjacent liquid cooling plates. The battery, the liquid cooling structure and the exhaust structure are integrated into a whole, and the whole structure is arranged in a box of the battery pack. Compared with the arrangement of the structures, the arrangement of the application can save more space, the volume of the battery pack can be reduced under the condition that the number of the single batteries is unchanged, or more single batteries can be arranged in the battery pack with the same volume.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and specifically relates to a battery pack and electrical equipment. Background Technology

[0002] Thermal management design is a crucial part of the overall battery pack design. When the battery overheats, it needs to be cooled to ensure that the battery operates within the normal temperature range. In modules with irregularly shaped batteries (such as those with a section cut off at one edge of a square battery to form a cross-section), the battery structure, liquid cooling structure, and venting structure occupy a large amount of space, which is not conducive to installing more batteries or reducing the size of the battery pack. Summary of the Invention

[0003] Purpose of the invention: This application provides a battery pack that aims to overcome the technical problem of the large space occupied by the battery structure, liquid cooling structure and venting structure in the battery pack; another purpose of this application is to provide an electrical device.

[0004] Technical solution: A battery pack according to an embodiment of this application includes:

[0005] The fastener has an exhaust chamber;

[0006] Multiple liquid cooling plates are arranged around the fixing member and are all connected to the fixing member. Each liquid cooling plate has a length direction, and the length directions of any two liquid cooling plates are parallel.

[0007] Multiple individual cells are arranged around the fixing member. Each individual cell is disposed between two adjacent liquid cooling plates. Each individual cell includes a first wall, a second wall, and a third wall connected to each other. The first wall is in contact with one of the two adjacent liquid cooling plates, the second wall is in contact with the other of the two adjacent liquid cooling plates, and the third wall is located between the first wall and the second wall. The third wall is provided with an explosion-proof valve, which is configured such that when the valve is activated, at least a portion of the ejected material is discharged through the exhaust chamber.

[0008] Along the length of the liquid cooling plate, the outer contour of the fastener is a regular polygon. The fastener includes multiple corner portions. The number of liquid cooling plates is the same as the number of corner portions. Each liquid cooling plate is connected to one corner portion. The axis of symmetry of each corner portion is perpendicular to the thickness direction of the liquid cooling plate connected to it.

[0009] The third wall has an angle α with the first wall or the second wall, satisfying: -10°<α-[180°-(180°×N-360°) / 2N]<10°;

[0010] Wherein, N is the number of the corners of the fastener, and N≥3.

[0011] In some embodiments, the fastener includes:

[0012] A plurality of connecting plates are arranged at intervals along the length of the liquid cooling plate, the plurality of liquid cooling plates are respectively arranged around each of the connecting plates and connected to each of the connecting plates, each of the connecting plates has the exhaust chamber, and the exhaust chambers of the plurality of connecting plates are interconnected.

[0013] In some embodiments, a gap space is formed between two adjacent connecting plates, and the connecting plate has a communication port that communicates with the exhaust chamber, and the exhaust chamber communicates with the corresponding gap space through the communication port;

[0014] The explosion-proof valve is positioned toward the space between the valves so that when the explosion-proof valve is activated, at least a portion of the ejected material passes through the space between the valves and enters the exhaust chamber.

[0015] In some embodiments, the connecting plate has a plurality of first through holes communicating with the exhaust chamber, and the first through holes are provided between two adjacent liquid cooling plates;

[0016] Each of the individual battery cells has an explosion-proof valve corresponding to at least one of the first through holes, so that when the explosion-proof valve is activated, at least a portion of the ejected material enters the exhaust chamber through the first through hole.

[0017] In some embodiments, the fastener includes:

[0018] A connecting pipe extends along the length of the liquid cooling plate, the liquid cooling plate surrounds the connecting pipe and is connected to the connecting pipe, the connecting pipe has the exhaust chamber and a plurality of second through holes communicating with the exhaust chamber, and a second through hole is provided between two adjacent liquid cooling plates;

[0019] Each of the individual battery cells has an explosion-proof valve corresponding to at least one of the second through holes, so that when the explosion-proof valve is activated, at least a portion of the ejected material enters the exhaust chamber through the second through hole.

[0020] In some embodiments, the battery pack further includes:

[0021] A partition plate is located inside the exhaust chamber and connected to the connecting pipe, and the partition plate divides the exhaust chamber into multiple flow channels;

[0022] The second through hole between two adjacent liquid cooling plates is connected to one of the flow channels, and when the explosion-proof valve of the single battery between two adjacent liquid cooling plates is activated, at least part of the ejected material enters the flow channel through the second through hole.

[0023] In some embodiments, the battery pack further includes:

[0024] An end plate is disposed on one side of the liquid cooling plate along its length and connected to the liquid cooling plate. The end plate has an exhaust outlet communicating with the exhaust chamber. Along the length direction, the end plate is abutted against the side of the fixing member facing the end plate. The exhaust outlet is used to discharge at least a portion of the ejected material.

[0025] In some embodiments, the end plate further includes a manifold cavity, a liquid inlet, and a plurality of manifold grooves, wherein the liquid inlet and the plurality of manifold grooves are respectively connected to the manifold cavity;

[0026] Each of the liquid cooling plates is embedded in one of the manifolds, and the liquid cooling channels of the liquid cooling plates are connected to the manifold cavity through the manifolds.

[0027] In some embodiments, the end plate includes:

[0028] A first plate, which is connected to the liquid cooling plate and has a plurality of the manifolds, and a first outlet communicating with the exhaust chamber;

[0029] The second plate is located on the side of the first plate away from the liquid cooling plate. The second plate has the liquid inlet. The second plate is connected to the first plate and forms the manifold. The second plate has a second outlet. The first outlet and the second outlet are connected to form the exhaust outlet.

[0030] In some embodiments, the end plate further includes:

[0031] A connecting flange is connected to the side of the second plate facing the first plate and is at least partially embedded in the first outlet. The connecting flange has a connecting hole that communicates with the second outlet, and the first outlet communicates with the second outlet through the connecting hole.

[0032] In some embodiments, the battery pack includes a plurality of the end plates, and the liquid cooling plate is connected to both sides along its length direction X by the end plates.

[0033] In some embodiments, a plurality of individual cells are arranged into a battery pack along the length of the liquid cooling plate, and the battery pack includes a plurality of battery packs arranged around the fixing member.

[0034] An electrical device comprising the battery pack described in any of the preceding claims.

[0035] Beneficial Effects: The battery module of this application embodiment includes: a fixing member having an exhaust chamber; multiple liquid cooling plates arranged around the fixing member and connected to the fixing member, each liquid cooling plate having a length direction, and the length directions of any two liquid cooling plates being parallel; and multiple individual cells arranged around the fixing member, each individual cell being disposed between two adjacent liquid cooling plates, each individual cell including a first wall, a second wall, and a third wall connected to each other, the first wall being in contact with one of the two adjacent liquid cooling plates, the second wall being in contact with the other of the two adjacent liquid cooling plates, and the third wall being located between the first wall and the second wall. An explosion-proof valve is installed on the third wall, configured to allow at least a portion of the ejected material to be discharged through the exhaust chamber when the valve is activated. Along the length of the liquid-cooled plate, the outer contour of the fixing member is a regular polygon, comprising multiple corner portions. The number of liquid-cooled plates is the same as the number of corner portions, with each liquid-cooled plate connected to one corner portion. The axis of symmetry of each corner portion is perpendicular to the thickness direction of the corresponding liquid-cooled plate. An angle α exists between the third wall and the first or second wall, satisfying: -10° < α - [180° - (180° × N - 360°) / 2N] < 10°; where N is the number of corner portions of the fixing member, and N ≥ 3. The liquid-cooled plate cools the battery, and the exhaust chamber allows the high-temperature ejected material to be discharged into the external environment when the battery is activated. By integrating the battery, liquid-cooled structure, and exhaust structure into a single unit, this integrated structure is housed within the battery pack housing. Compared to setting these structures separately, the arrangement in this application can save more space, reduce the size of the battery pack while keeping the number of individual cells the same, or allow more individual cells to be installed inside a battery pack of the same size using this integrated arrangement.

[0036] Meanwhile, the angle α between the third wall and the first or second wall satisfies: -10°<α-[180°-(180°×N-360°) / 2N]<10°, which allows the first and second walls to have a relatively tight fit with the corresponding liquid cooling plates, thereby giving the entire battery pack better airtightness. This can prevent the high-temperature gas emitted by the explosion-proof valve from escaping through the gaps between the first and second walls and the corresponding liquid cooling plates, and can also prevent the high-temperature gas from raising the temperature of the individual cells and affecting them. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the exploded structure of the battery pack in the first embodiment of this application;

[0039] Figure 2 This is a schematic diagram of the overall three-dimensional structure in the first embodiment of this application;

[0040] Figure 3 This is a three-dimensional structural diagram of the hidden second plate in the first embodiment of this application;

[0041] Figure 4 This is a three-dimensional structural diagram of the liquid cooling plate and the fastener in the first embodiment of this application;

[0042] Figure 5 This is a side view of the liquid cooling plate and the fastener in the first embodiment of this application;

[0043] Figure 6 This is a partial side view of the liquid cooling plate and the fastener in the first embodiment of this application;

[0044] Figure 7 This is a perspective view of a single battery cell in an embodiment of this application;

[0045] Figure 8 This is a perspective view of the first plate in the embodiments of this application;

[0046] Figure 9 This is a perspective view of the second plate in the embodiments of this application;

[0047] Figure 10 This is a perspective view of the connecting flange in an embodiment of this application;

[0048] Figure 11 This is a schematic diagram of the exploded structure of the battery pack in the second embodiment of this application;

[0049] Figure 12 A perspective view of the second embodiment of this application, concealing an end plate and a battery pack;

[0050] Figure 13 This is a perspective view of the liquid cooling plate and connecting pipe in the second embodiment of this application;

[0051] Figure 14 This is a cross-sectional perspective view of the liquid cooling plate and connecting pipe in the second embodiment of this application;

[0052] Figure 15 This is a perspective view of the connecting pipe in the second embodiment of this application;

[0053] Reference numerals: 10-Fixing component; 11-Exhaust chamber; 111-Flow channel; 12-Connecting plate; 121-Gap space; 122-First through hole; 13-Connecting pipe; 131-Second through hole; 14-Connecting port; 15-Corner; 20-Liquid cooling plate; 21-Liquid cooling channel; 30-Single battery; 31-First wall; 32-Second wall; 33-Third wall; 331-Explosion-proof valve; 40-Separator plate; 50-End plate; 51-Exhaust outlet; 52-Gathering chamber; 53-Liquid outlet; 54-Gathering groove; 55-First plate; 551-First outlet; 56-Second plate; 561-Second outlet; 57-Connecting flange; 571-Connecting hole; 60-Battery pack; X-Length direction; Y-Thickness direction. Detailed Implementation

[0054] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0055] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified.

[0056] In the overall design of a battery pack, the battery is equivalent to the "heart" of the pack, making a well-designed battery particularly important. Currently, batteries on the market mainly come in two designs: prismatic and cylindrical. Due to their shape limitations, cylindrical batteries have a lower overall space utilization rate than prismatic batteries, thus prismatic batteries have a slightly higher utilization rate. The current trend in battery pack development is gradually shifting from CTM and CTP to CTB, with the core idea being how to maximize volumetric and mass energy density with minimal space. The irregularly shaped battery proposed in this application further saves space based on the prismatic battery design. Specifically, it involves an irregular design of the prismatic battery, with a section cut away from one edge to create a cross-section. This irregular surface houses the positive and negative terminals and a vent valve. The advantage of this design is that it saves a significant amount of space, leaving more room for the vehicle chassis design, without reducing volumetric energy density as much as possible.

[0057] As is well known, thermal management design is a crucial part of the overall battery pack design. When the battery overheats, it needs to be cooled to ensure that the battery operates within the normal temperature range. In modules with irregularly shaped batteries (shaped like a prismatic battery cell with a section cut off at one edge to form a cross-section), the irregular shape requires a large space for the battery structure, liquid cooling structure, and venting structure, which is not conducive to installing more batteries or reducing the size of the battery pack.

[0058] In view of the above, embodiments of this application provide a battery pack to overcome at least one of the above-mentioned technical problems.

[0059] Please see Figure 1 and Figure 11 In this embodiment, the battery pack comprises several key structures, including a fixing member 10, multiple liquid cooling plates 20, and multiple individual battery cells 30. The fixing member 10 has an exhaust chamber 11. Multiple liquid cooling plates 20 are spaced apart around the fixing member 10 and are all connected to it. Each liquid cooling plate 20 has a length direction X, and the length directions X of any two liquid cooling plates 20 are parallel. That is, by fixing multiple liquid cooling plates 20 to the outer periphery of the fixing member 10, and arranging them around the fixing member 10, the multiple liquid cooling plates 20 and the fixing member 10 can be connected into a whole. Simultaneously, multiple individual battery cells 30 are also arranged around the fixing member 10, with a certain placement space between adjacent liquid cooling plates 20, allowing each individual battery cell 30 to be placed within the placement space between adjacent liquid cooling plates 20. The individual battery cell 30 serves as an energy storage unit and needs to be maintained within a suitable temperature range to ensure its normal operation. To achieve this goal, the design of the individual battery cell 30 considers direct contact with the liquid cooling plates 20. The single cell 30 includes a first wall 31, a second wall 32, and a third wall 33 connected together. The first wall 31 is in contact with one of the two adjacent liquid cooling plates 20, and the second wall 32 is in contact with the other of the two adjacent liquid cooling plates 20. Since the main function of the liquid cooling plates 20 is to absorb and dissipate heat through the circulating cooling liquid, thereby achieving cooling of the corresponding structure, the first wall 31 and the second wall 32 of the single cell 30 are respectively in contact with the two adjacent liquid cooling plates 20. This increases the contact area between the irregularly shaped single cell 30 and the corresponding liquid cooling plate 20, allowing the heat generated by the single cell 30 during operation to be transferred to the cooling liquid within the liquid cooling plate 20. The flowing cooling liquid carries away some of the heat from the single cell 30, achieving the effect of cooling the irregularly shaped single cell 30.

[0060] The third wall 33 on the individual battery 30 is located between the first wall 31 and the second wall 32, facing the fixing member 10. An explosion-proof valve 331 is provided on the third wall 33. The explosion-proof valve 331 is configured so that when the valve is activated, at least a portion of the ejected material is discharged through the exhaust chamber 11. The ejected material can be high-temperature gas and liquid. The function of the explosion-proof valve 331 is to reduce the internal pressure of the individual battery 30 when necessary. When the valve is activated, the explosion-proof valve 331 opens, allowing some of the high-temperature gas and liquid inside the individual battery 30 to be discharged through the explosion-proof valve 331. The explosion-proof valve 331 can be connected to the exhaust chamber 11 on the fixing member 10, facilitating the discharge of some high-temperature gas and liquid to the outside through the exhaust chamber 11, ensuring the safe operation of the device. This convenient method of discharging some of the high-temperature ejected material to the outside rapidly reduces the temperature of the irregularly shaped individual battery 30, thus cooling and lowering the temperature of the individual battery 30.

[0061] The liquid cooling plate 20 serves as a cooling structure to cool the individual battery cells 30, while the exhaust chamber 11 serves as an exhaust structure to expel the high-temperature ejected material from the individual battery cells 30 into the external environment. By integrating the battery structure, liquid cooling structure, and exhaust structure into a single unit, this integrated structure is housed within the battery pack housing. Compared to setting these structures separately, the arrangement in this application saves more space. While maintaining the same number of individual battery cells 30, the volume of the battery pack can be reduced. Alternatively, a battery pack of the same volume can accommodate more individual battery cells 30 using this integrated arrangement, thus improving space utilization.

[0062] Please see Figure 1 , Figure 4 , Figure 6 , Figure 7 , Figure 11 and Figure 15In some embodiments, along the length direction X of the liquid cooling plate 20, the outer contour of the fastener 10 is a regular polygon, such as a regular quadrilateral, a regular pentagon, or a regular hexagon. The fastener 10 includes multiple corner portions 15, and the number of liquid cooling plates 20 is the same as the number of corner portions 15. Each liquid cooling plate 20 is connected to a corner portion 15. The fastener 10 here is an integral structure and cannot be simply regarded as one of the multiple connecting plates 12 or a part of the connecting pipe 13. It should be viewed as a whole. Therefore, the corner portions 15 at corresponding positions on the fastener 10 should also be viewed as a whole. The corresponding position refers to the position where the fastener 10 is connected to a liquid cooling plate 20. Each connection position has a corner portion 15, so the number of corner portions 15 is the same as the number of liquid cooling plates 20, and each liquid cooling plate 20 is connected to a corner portion 15. The axis of symmetry of each corner portion 15 is perpendicular to the thickness direction Y of the liquid cooling plate 20 to which it is connected. The cross-sectional shape of the corner portion 15 can be a corner, a trapezoid, or other shapes, as long as the axis of symmetry of the shape is perpendicular to the thickness direction Y of the liquid cooling plate 20. The third wall 33 has an angle α with the first wall 31 or the second wall 32, satisfying: -10°<α-[180°-(180°×N-360°) / 2N]<10°; where N is the number of corners of the fixing member 10, and N≥3.

[0063] Specifically, α-[180°-(180°×N-360°) / 2N] can be any value from -10° to 10° (excluding -10° and 10°), such as: -9°, -6°, -3°, 0°, 3°, 6°, 9°. It should be noted that when the first wall 31 and the second wall 32 are respectively attached to the two adjacent liquid cooling plates 20, due to certain processing errors, the first wall 31 and the second wall 32 may not be perfectly fitted to the liquid cooling plate 20. Gaps may exist between the first wall 31 and the corresponding liquid cooling plate 20, or between the second wall 32 and the corresponding liquid cooling plate 20. The existence of these gaps may lead to a small amount of gas leakage. The airtightness of the battery pack can be tested using the battery thermal diffusion test method. According to the recommended method in GB / T31467.3-2015 Safety Specification for Lithium Battery Packs for Electric Vehicles, individual cells near the center of the battery pack or surrounded by other individual cells are selected as test objects. Generally, steel needles are chosen for piercing the target, with a suitable needle diameter ranging from 3mm to 8mm. The needle tip is conical, with a recommended angle of 20° to 60°. The piercing speed is typically between 0.1mm / s and 10mm / s. The piercing location and direction are generally chosen to trigger thermal runaway in a single cell.

[0064] In the following, a plurality of examples and comparative examples are provided to illustrate the effect of the battery pack of the present application, wherein the value of N can be obtained directly through observation, and α can be obtained by measuring the included angle between the first wall 31 and the third wall 33 or the included angle between the second wall 32 and the third wall 33 using tools such as an optical measuring instrument, a digital goniometer or an angle sensor. The effect of α-[180°-(180°×N-360°) / 2N] on the airtightness of the battery pack can be determined by the rate of thermal diffusion. If the thermal diffusion rate is within the standard range, it is determined to be qualified; if the thermal diffusion rate inside the battery pack is not within the standard range, it is determined to be unqualified. The test results of the examples and the comparative examples are shown in the following table:

[0065]

[0066]

[0067] As shown in the above table, by controlling α-[180°-(180°×N-360°) / 2N] within the range of -10° to 10° (excluding -10° and 10°), the thermal diffusion rates are all qualified when the thermal diffusion test is performed on the battery pack. That is to say, by controlling the difference between the included angle between the liquid cooling plate 20 and the edge of the outer contour of the adjacent fixing member 10 and the included angle between the first wall 31 and the third wall 33 or the included angle between the second wall 32 and the third wall 33 within the range of -10° to 10° (excluding -10° and 10°), the first wall 31, the second wall 32 and the corresponding liquid cooling plate 20 can be in relatively close contact with each other, so that the entire battery pack has relatively good airtightness. Even if there is an error in the processing of the device structure, the airtightness of the battery pack will not be affected, which can prevent the high-temperature gas ejected from the explosion-proof valve 331 from escaping through the gap between the first wall 31, the second wall 32 and the corresponding liquid cooling plate 20, and can also prevent the high-temperature gas from increasing the temperature of the cell 30 and affecting the cell 30.

[0068] Please refer to Figure 1 and Figure 4In some embodiments, the fixing member 10 includes a plurality of connecting plates 12 spaced apart along the length X direction of the liquid cooling plate 20. The plurality of liquid cooling plates 20 are respectively arranged around and connected to each connecting plate 12. Each connecting plate 12 has an exhaust chamber 11, and the exhaust chambers 11 of the plurality of connecting plates 12 are interconnected. That is, the design of the fixing member 10 can be further refined in the battery pack. The fixing member 10 can be composed of a plurality of connecting plates 12 spaced apart along the length X direction of the liquid cooling plate 20. The plurality of liquid cooling plates 20 are arranged around these connecting plates 12 and connected to each connecting plate 12. Each connecting plate 12 has an independent exhaust chamber 11 for discharging high-temperature gas and liquid discharged from the explosion-proof valve 331. These exhaust chambers 11 are located inside each connecting plate 12 and penetrate through the connecting plate 12. The exhaust chambers 11 of the plurality of connecting plates 12 are interconnected to ensure that the gas or liquid can flow smoothly and be released from the device. The advantage of this exhaust chamber 11 design is that it makes the exhaust of the entire battery pack more uniform and efficient. Through the spaced arrangement of the connecting plates 12, each explosion-proof valve 331 can be connected to its corresponding exhaust chamber 11 to provide a better gas or liquid flow path. In this way, the gas or liquid generated in the device can be collected and discharged more effectively, thereby reducing the device's pressure and temperature, further improving the device's cooling effect and stable operation.

[0069] Please see Figure 1 , Figure 4 , Figure 5 and Figure 7 In some embodiments, a space 121 is formed between two adjacent connecting plates 12. Each connecting plate 12 has a communication port 14 that communicates with an exhaust chamber 11. The exhaust chamber 11 communicates with the corresponding space 121 through the communication port 14. In the fixing member 10, there are one or more space 121s. These space 121s are located between two adjacent connecting plates 12 and are gaps between them. Each connecting plate 12 has one or more communication ports 14 that communicate with the corresponding exhaust chamber 11. These communication ports 14 allow the exhaust chamber 11 to communicate with the corresponding space 121, so that high-temperature gas or liquid entering the exhaust chamber 11 can enter the corresponding space 121 through the communication port 14, and then enter another exhaust chamber 11 through the corresponding communication port 14, and so on, until the high-temperature gas or liquid is discharged outside the device.

[0070] The explosion-proof valve 331 on the individual battery 30 is positioned towards the spacer 121 so that when the explosion-proof valve 331 is activated, at least a portion of the ejected material enters the exhaust chamber 11 through the spacer 121. Through the spacer 121, when the explosion-proof valve 331 is activated, the ejected material can be more evenly distributed in the exhaust chamber 11, preventing it from concentrating in one location and causing excessive pressure. Furthermore, the spacer 121 provides a pathway for the ejected material to flow smoothly into the exhaust chamber 11, thereby maintaining the stability and safety of the system.

[0071] Please see Figure 1 , Figure 4 , Figure 5 and Figure 7 In some embodiments, the connecting plate 12 has a plurality of first through holes 122 communicating with the exhaust chamber 11, and a first through hole 122 is provided between two adjacent liquid cooling plates 20. Each individual battery cell 30 has an explosion-proof valve 331 corresponding to at least one first through hole 122, so that when the explosion-proof valve 331 is activated, at least a portion of the ejected material enters the exhaust chamber 11 through the first through hole 122. In the battery pack, each connecting plate 12 has a plurality of first through holes 122 communicating with the exhaust chamber 11. These first through holes 122 are located on the outer periphery of the connecting plate 12 and are directly connected to the exhaust chamber 11. Simultaneously, the first through holes 122 are also located between two adjacent liquid cooling plates 20, thereby facilitating the correspondence between the explosion-proof valve 331 of the individual battery cell 30 between the two liquid cooling plates 20 and the first through hole 122, so that when the explosion-proof valve 331 is activated, at least a portion of the high-temperature gas or liquid enters the exhaust chamber 11 through the first through hole 122.

[0072] Please see Figure 11 , Figure 12 and Figure 13In some embodiments, the fixing member 10 may also be a connecting pipe 13 extending along the length direction X of the liquid cooling plate 20. The liquid cooling plate 20 is arranged around the connecting pipe 13 and connected to the connecting pipe 13. The connecting pipe 13 has an exhaust chamber 11 and a plurality of second through holes 131 communicating with the exhaust chamber 11. A second through hole 131 is provided between two adjacent liquid cooling plates 20. The explosion-proof valve 331 of each individual battery 30 is correspondingly arranged with at least one second through hole 131 so that when the explosion-proof valve 331 is activated, at least part of the ejected material enters the exhaust chamber 11 through the second through hole 131. The explosion-proof valve 331 of each individual battery 30 is correspondingly arranged with at least one second through hole 131 so that the ejected material can quickly and effectively enter the exhaust chamber 11 from the individual battery 30 through the second through hole 131. This means that the position of the explosion-proof valve 331 of each individual battery 30 corresponds to the second through hole 131 on the connecting pipe 13. This design allows at least a portion of the ejected material to enter the exhaust chamber 11 through the corresponding second through-hole 131 when the explosion-proof valve 331 is activated, and then be further released from the entire device. It also helps to achieve balanced and stable venting or drainage, preventing the ejected material from accumulating and piling up around the individual battery cells 30, thus improving the safety and reliability of the device.

[0073] Please see Figure 11 , Figure 12 , Figure 13 , Figure 14 and Figure 15 In some embodiments, the battery pack further includes a separator 40. The separator 40 is an assembly located within the exhaust chamber 11 and connected to the connecting pipe 13. The separator 40 divides the exhaust chamber 11 into multiple flow channels 111. A second through-hole 131 between two adjacent liquid cooling plates 20 corresponds to a flow channel 111, and when the explosion-proof valve 331 of a single cell 30 between two adjacent liquid cooling plates 20 is activated, at least a portion of the ejected material enters the flow channel 111 through the second through-hole 131. The separator 40 is an assembly located within the exhaust chamber 11 and connected to the connecting pipe 13. By configuring the separator 40, the exhaust chamber 11 is divided into multiple flow channels 111, which helps guide the ejected material to move within the exhaust chamber 11 and prevents it from concentrating in one place, while also preventing the ejected material from being sprayed onto opposing single cells 30.

[0074] Please see Figure 1 , Figure 2 , Figure 11 and Figure 12In some embodiments, the battery pack further includes an end plate 50 disposed on one side of the liquid cooling plate 20 along its length direction X. The end plate 50 is located on and connected to the liquid cooling plate 20. The end plate 50 has an exhaust outlet 51 communicating with the exhaust chamber 11. Along the length direction X, the end plate 50 is abutted against the side of the fixing member 10 facing the end plate 50. When the fixing member 10 is composed of multiple connecting plates 12, since the multiple connecting plates 12 are arranged at intervals along the length direction X, the side of the connecting plate 12 closest to the end plate 50 is abutted against the end plate 50. The exhaust outlet 51 is used to discharge at least a portion of the ejected material. That is, when the explosion-proof valve 331 of the single cell 30 is activated, the ejected material injected into the exhaust chamber 11 will be discharged to the outside of the device through the exhaust outlet 51 to ensure the stable and safe operation of the device.

[0075] Please see Figure 1 , Figure 2 , Figure 3 , Figure 8 and Figure 9 In some embodiments, the end plate 50 further includes a manifold 52, a liquid outlet 53, and multiple manifold channels 54. The liquid outlet 53 facilitates the introduction or discharge of cooling medium (such as water or liquid coolant), and the liquid outlet 53 and the multiple manifold channels 54 are respectively connected to the manifold 52. The manifold 52 is a cavity for collecting and containing cooling medium. The manifold 52 is located on one side of the end plate 50. Each liquid cooling plate 20 is embedded in a manifold channel 54, and the liquid cooling channel 21 of the liquid cooling plate 20 is connected to the manifold 52 through the manifold channel 54. That is, the cooling medium can enter the manifold 52 through the liquid outlet 53, and since the manifold 52 is connected to the liquid cooling channel 21 on the liquid cooling plate 20 through the manifold channel 54, the cooling medium can enter the liquid cooling channel 21. The liquid cooling plate 20 is attached to the surface of the single cell 30. Through heat transfer, the heat on the single cell 30 is transferred to the cooling medium, which can then remove the heat from the single cell 30, thus achieving a cooling effect.

[0076] Please see Figure 1 , Figure 3 , Figure 4 , Figure 8 and Figure 9In some embodiments, the end plate 50 includes a first plate 55 and a second plate 56. The first plate 55 is connected to the liquid cooling plate 20 and has multiple manifolds 54, which can be respectively connected to the liquid cooling channels 21 on the liquid cooling plates 20, so that the cooling medium in the manifold cavity 52 can enter the liquid cooling channels 21. The first plate 55 has a first outlet 551 connected to the exhaust cavity 11, and the second plate 56 has a second outlet 561. The first outlet 551 and the second outlet 561 are connected to form an exhaust outlet 51. The ejected material from the single cell 30 can be sprayed to the outside of the device through the exhaust cavity 11 and the exhaust outlet 51. The second plate 56 is located on the side of the first plate 55 away from the liquid cooling plate 20. The first plate 55 and the second plate 56 can be connected by welding or bolts. The second plate 56 has a liquid outlet 53, through which the cooling medium can enter the manifold cavity 52, and the cooling medium in the manifold cavity 52 can also be discharged through the liquid outlet 53. The second plate 56 is connected to the first plate 55 and forms a manifold 52. A sealing structure can be provided between the second plate 56 and the first plate 55 to prevent leakage of the cooling medium in the manifold 52.

[0077] Please see Figure 1 , Figure 8 , Figure 9 and Figure 10 In some embodiments, the end plate 50 further includes a connecting flange 57, which is connected to the side of the second plate 56 facing the first plate 55 and is at least partially embedded in the first outlet 551. The connecting flange 57 can be a component with a specific shape and size, at least partially embedded in the first outlet 551, which can play a certain positioning role in the connection between the first plate 55 and the second plate 56, and can also improve the tightness of the connection between the two. The connecting flange 57 has a connecting hole 571 communicating with the second outlet 561, through which the first outlet 551 communicates with the second outlet 561. This connecting hole 571 allows the first outlet 551 to communicate with the second outlet 561. In this way, the ejected material can flow from the first outlet 551 into the connecting hole 571, and connect to the second outlet 561 through the connecting flange 57, and finally be discharged through the outlet of the second plate 56. The design of the connecting flange 57 and the position of the connecting hole 571 are both to ensure that the ejected material can flow smoothly from the first plate 55 to the second plate 56.

[0078] Please see Figure 1 , Figure 8 , Figure 9 and Figure 10In some embodiments, the battery pack includes multiple end plates 50, and the liquid cooling plate 20 is connected to both sides along its length direction X. The number of end plates 50 can be multiple. Along the length direction X of the liquid cooling plate 20, the end plates 50 are located on both sides of the liquid cooling plate 20, and are fitted into the liquid cooling plate 20. They can be used to introduce or discharge cooling medium into the interior of the liquid cooling plate 20, and also facilitate the discharge of ejected material from the device.

[0079] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 11 , Figure 12 and Figure 13 In some embodiments, multiple individual cells 30 are arranged into a battery pack 60 along the length direction X of the liquid cooling plate 20. The battery pack includes multiple battery packs 60, which are arranged around the fixing member 10. The battery pack 60 is a whole formed by multiple individual cells 30 arranged along the length direction X. The liquid cooling plate 20 is a key component for conducting and dissipating heat, and also serves as the basis for the arrangement of the battery packs 60. Each battery pack 60 is positioned between two adjacent liquid cooling plates 20, which can improve the cooling efficiency of the individual cells 30 and ensure the stability of the battery pack 60 arrangement.

[0080] An electrical device includes a battery pack as described above. The battery pack provides power to the electrical device. The electrical device can be a mobile phone, portable device, laptop, electric vehicle, electric car, ship, spacecraft, electric toy, or power tool, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0081] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0082] The battery pack and electrical equipment provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized in that, include: The fastener has an exhaust chamber; Multiple liquid cooling plates are arranged around the fixing member and are all connected to the fixing member. Each liquid cooling plate has a length direction, and the length directions of any two liquid cooling plates are parallel. Multiple individual cells are arranged around the fixing member. Each individual cell is disposed between two adjacent liquid cooling plates. Each individual cell includes a first wall, a second wall, and a third wall connected to each other. The first wall is in contact with one of the two adjacent liquid cooling plates, the second wall is in contact with the other of the two adjacent liquid cooling plates, and the third wall is located between the first wall and the second wall. The third wall is provided with an explosion-proof valve, which is configured such that when the valve is activated, at least a portion of the ejected material is discharged through the exhaust chamber. Along the length of the liquid cooling plate, the outer contour of the fastener is a regular polygon. The fastener includes multiple corner portions. The number of liquid cooling plates is the same as the number of corner portions. Each liquid cooling plate is connected to one corner portion. The axis of symmetry of each corner portion is perpendicular to the thickness direction of the liquid cooling plate connected to it. The third wall has an angle α with the first wall or the second wall, satisfying: -10°<α-[180°-(180°×N-360°) / 2N]<10°; Wherein, N is the number of the corners of the fastener, and N≥3.

2. The battery pack according to claim 1, characterized in that, The fastener includes: A plurality of connecting plates are arranged at intervals along the length of the liquid cooling plate, the plurality of liquid cooling plates are respectively arranged around each of the connecting plates and connected to each of the connecting plates, each of the connecting plates has the exhaust chamber, and the exhaust chambers of the plurality of connecting plates are interconnected.

3. The battery pack according to claim 2, characterized in that, An interval space is formed between two adjacent connecting plates, and the connecting plate has a communication port that communicates with the exhaust chamber. The exhaust chamber communicates with the corresponding interval space through the communication port. The explosion-proof valve is positioned toward the space between the valves so that when the explosion-proof valve is activated, at least a portion of the ejected material passes through the space between the valves and enters the exhaust chamber.

4. The battery pack according to claim 2, characterized in that, The connecting plate has a plurality of first through holes communicating with the exhaust chamber, and the first through holes are provided between two adjacent liquid cooling plates; Each of the individual battery cells has an explosion-proof valve corresponding to at least one of the first through holes, so that when the explosion-proof valve is activated, at least a portion of the ejected material enters the exhaust chamber through the first through hole.

5. The battery pack according to claim 1, characterized in that, The fastener includes: A connecting pipe extends along the length of the liquid cooling plate, the liquid cooling plate surrounds the connecting pipe and is connected to the connecting pipe, the connecting pipe has the exhaust chamber and a plurality of second through holes communicating with the exhaust chamber, and a second through hole is provided between two adjacent liquid cooling plates; Each of the individual battery cells has an explosion-proof valve corresponding to at least one of the second through holes, so that when the explosion-proof valve is activated, at least a portion of the ejected material enters the exhaust chamber through the second through hole.

6. The battery pack according to claim 5, characterized in that, The battery pack includes: A partition plate is located inside the exhaust chamber and connected to the connecting pipe, and the partition plate divides the exhaust chamber into multiple flow channels; The second through hole between two adjacent liquid cooling plates is connected to one of the flow channels, and when the explosion-proof valve of the single battery between two adjacent liquid cooling plates is activated, at least part of the ejected material enters the flow channel through the second through hole.

7. The battery pack according to claim 1, characterized in that, The battery pack includes: An end plate is disposed on one side of the liquid cooling plate along its length and connected to the liquid cooling plate. The end plate has an exhaust outlet communicating with the exhaust chamber. Along the length direction, the end plate is abutted against the side of the fixing member facing the end plate. The exhaust outlet is used to discharge at least a portion of the ejected material.

8. The battery pack according to claim 7, characterized in that, The end plate also has a manifold cavity, a liquid inlet, and multiple manifold grooves, wherein the liquid inlet and multiple manifold grooves are respectively connected to the manifold cavity; Each of the liquid cooling plates is embedded in one of the manifolds, and the liquid cooling channels of the liquid cooling plates are connected to the manifold cavity through the manifolds.

9. The battery pack according to claim 8, characterized in that, The end plate includes: A first plate, which is connected to the liquid cooling plate and has a plurality of the manifolds, and a first outlet communicating with the exhaust chamber; The second plate is located on the side of the first plate away from the liquid cooling plate. The second plate has the liquid inlet. The second plate is connected to the first plate and forms the manifold. The second plate has a second outlet. The first outlet and the second outlet are connected to form the exhaust outlet.

10. The battery pack according to claim 9, characterized in that, The end plate also includes: A connecting flange is connected to the side of the second plate facing the first plate and is at least partially embedded in the first outlet. The connecting flange has a connecting hole that communicates with the second outlet, and the first outlet communicates with the second outlet through the connecting hole.

11. The battery pack according to claim 1, characterized in that, Along the length of the liquid cooling plate, a plurality of individual cells are arranged into a battery pack, and the battery pack includes a plurality of battery packs, which are arranged around the fixing member.

12. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 11.

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